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 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 // WARNING: You should *NOT* be using this class directly.  PlatformThread is

 // the low-level platform-specific abstraction to the OS's threading interface.

 // You should instead be using a message-loop driven Thread, see thread.h.

 #ifndef BASE_PLATFORM_THREAD_H_

 #define BASE_PLATFORM_THREAD_H_

 #include "base/basictypes.h"

 // PlatformThreadHandle should not be assumed to be a numeric type, since the

 // standard intends to allow pthread_t to be a structure.  This means you

 // should not initialize it to a value, like 0.  If it's a member variable, the

 // constructor can safely "value initialize" using () in the initializer list.

 #if defined(OS_WIN)

 #include <windows.h>

 typedef DWORD PlatformThreadId;

 typedef void* PlatformThreadHandle;  // HANDLE

 #elif defined(OS_POSIX)

 #include <pthread.h>

 typedef pthread_t PlatformThreadHandle;

 #if defined(OS_LINUX) || defined(OS_OPENBSD) || defined(__GLIBC__)

 #include <unistd.h>

 typedef pid_t PlatformThreadId;

 #elif defined(OS_BSD)

 #include <sys/types.h>

 typedef lwpid_t PlatformThreadId;

 #elif defined(OS_MACOSX)

 #include <mach/mach.h>

 typedef mach_port_t PlatformThreadId;

 #endif

 #endif

 // A namespace for low-level thread functions.

 class PlatformThread {

  public:

   // Gets the current thread id, which may be useful for logging purposes.

   static PlatformThreadId CurrentId();

   // Yield the current thread so another thread can be scheduled.

   static void YieldCurrentThread();

   // Sleeps for the specified duration (units are milliseconds).

   static void Sleep(int duration_ms);

   // Sets the thread name visible to a debugger.  This has no effect otherwise.

   static void SetName(const char* name);

   // Implement this interface to run code on a background thread.  Your

   // ThreadMain method will be called on the newly created thread.

   class Delegate {

    public:

     virtual ~Delegate() {}

     virtual void ThreadMain() = 0;

   };

   // Creates a new thread.  The |stack_size| parameter can be 0 to indicate

   // that the default stack size should be used.  Upon success,

   // |*thread_handle| will be assigned a handle to the newly created thread,

   // and |delegate|'s ThreadMain method will be executed on the newly created

   // thread.

   // NOTE: When you are done with the thread handle, you must call Join to

   // release system resources associated with the thread.  You must ensure that

   // the Delegate object outlives the thread.

   static bool Create(size_t stack_size, Delegate* delegate,

                      PlatformThreadHandle* thread_handle);

   // CreateNonJoinable() does the same thing as Create() except the thread

   // cannot be Join()'d.  Therefore, it also does not output a

   // PlatformThreadHandle.

   static bool CreateNonJoinable(size_t stack_size, Delegate* delegate);

   // Joins with a thread created via the Create function.  This function blocks

   // the caller until the designated thread exits.  This will invalidate

   // |thread_handle|.

   static void Join(PlatformThreadHandle thread_handle);

  private:

   DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformThread);

 };

 #endif  // BASE_PLATFORM_THREAD_H_